[nostrora]

Most attacks come from USA, Russia and China from what I have read about. If you want to restrict your server to specific people or locations you can use IP range in your firewall. Unwanted users won't be able to DDoS your server how hard they try because their connections will be refused. You should do this if you aren't thinking about making your game public though xD

from what i know, running a game server seems to be quite a lot of trouple for every one.
i don't know much about iptables(yet ) but could one just punish an ip for sending to much requests with iptables? because if that's was doable than this might be a good solution to all game servers, am i right?